Article
Astronomy & Astrophysics
Zheng Zhao, Kai Xu, Attaphon Kaewsnod, Xuyang Liu, Ayut Limphirat, Yupeng Yan
Summary: This study calculates the masses of qq(Q) over bar(Q) over bar tetraquark states using a constituent quark model and compares the theoretical predictions with experimental results, suggesting possible assignments.
Article
Physics, Particles & Fields
Xiang Wei, Qing-Hua Shen, Ju-Jun Xie
Summary: This theoretical study investigates the D (D) over barK three body system using the fixed center approximation and the chiral unitary approach. The study finds a resonance structure in the three body K-(D (D) over bar)(X(3720)) scattering amplitude, supporting the formation of a D (D) over barK bound state.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Rui-Rui Dong, Niu Su, Hua-Xing Chen
Summary: This study investigates the exotic hadrons with quantum numbers J(PC) = 4(+-), which cannot be reached by traditional (q) over barq mesons and qqq baryons. The researchers systematically construct various diquark antidiquark interpolating currents and use QCD sum rules to calculate correlation functions. The obtained results suggest the existence of a purely exotic hadron, a fully-strange tetraquark state of J(PC) = 4(+-), with a possible decay mode into the P-wave phi (1020)f(2)'(1525) channel.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Stefan Meinel, Martin Pflaumer, Marc Wagner
Summary: In this study, lattice QCD is used to investigate the existence of stable antiheavy-antiheavy-light-light tetraquarks. Clear evidence for the existence of a strong-interaction-stable (b) over bar(b) over bar us tetraquark was found.
Article
Physics, Particles & Fields
Hui-Hui Duan, Yong-Lu Liu, Ming-Qiu Huang
Summary: In this study, the semileptonic decay processes of Λ(b) -> Λ(c) are analyzed using the light-cone sum rule approach. The form factors of the Λ(b) baryon transition matrix element are calculated using the light-cone distribution amplitudes obtained from the QCD sum rule in the heavy quark effective field theory framework. The results are consistent with the newest experimental result and other theoretical calculations and predictions.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Qin Qin, Jing-Liang Qiu, Fu-Sheng Yu
Summary: Discoveries of tetraquarks not only enrich the hadronic spectrum but also provide more platforms to understand quantum chromodynamics. We study the production processes of hidden-charm and open-charm tetraquarks in B decays by analyzing their topological amplitudes. Relations between different channels are found, which confront tests by experiments to probe the nature of the tetraquarks. Furthermore, promising channels to find more tetraquarks are proposed.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Multidisciplinary Sciences
Rudolf N. N. Faustov, Vladimir O. O. Galkin, Elena M. M. Savchenko
Summary: This study calculates the masses of fully heavy tetraquarks' ground and excited states (namely 1P, 2S, 1D, 2P, 3S) comprising charm and bottom quarks and antiquarks. The calculations are based on the diquark-antidiquark picture within the relativistic quark model and employ the quasipotential approach and quantum chromodynamics. The findings demonstrate that most investigated states of tetraquarks exist as broad resonances above the decay thresholds.
Article
Astronomy & Astrophysics
Qi Meng, Masayasu Harada, Emiko Hiyama, Atsushi Hosaka, Makoto Oka
Summary: The spectrum of the doubly heavy tetraquarks, bb (q) over bar(q) over bar, is investigated in a constituent quark model. Several narrow resonant states are found, including a mixed state of a compact tetraquark and a B* B* scattering state driven by a strong color Coulombic attraction between the bb quarks. In addition, negative-parity excited resonances exhibit similar structures to the lambda-mode of a singly heavy baryon due to the attractive correlation for the doubly heavy diquark.
Article
Astronomy & Astrophysics
Feng-Xiao Liu, Ming-Sheng Liu, Xian-Hui Zhong, Qiang Zhao
Summary: In this study, 36 tetraquark configurations were constructed for the tetraquark ss (s) over bar(s) over bar system, and the mass spectrum was predicted using a nonrelativistic potential quark model without the diquark-antidiquark approximation. The resonances f(0)(2200), f(2)(2340), and the newly observed X(2500) were identified as potential candidates for specific tetraquark states, providing guidance for experimental searches. The study also predicted the mass range for certain T-ss (s) over bar(s) over bar states, indicating the likelihood of observing these states in experiments.
Article
Physics, Particles & Fields
Halil Mutuk
Summary: We study the S-wave mass spectra of flavor exotic triply-heavy tetraquark states cc (c) over bar(q) over bar, cc (b) over bar(q) over bar, bb (c) over bar(q) over bar, and bb (b) over bar(q) over bar. Using a diquark-antidiquark scheme, we solve the Schrodinger equation and make calculations in a nonrelativistic quark model with a color interaction described by a potential computed in AdS/QCD. Our findings show stable state candidates in the cc (c) over bar(q) over bar sector, while in the cc (b) over bar(q) over bar, bb (c) over bar(q) over bar, and bb bq sectors, all the states lie above corresponding S-wave meson-meson thresholds.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
W. G. Parrott, C. Bouchard, C. T. H. Davies
Summary: Using HPQCD's recent lattice QCD determination of B -> K scalar, vector and tensor form factors, we calculate the Standard Model differential branching fractions for B -> Kl(+)/l(-), B- -> Kl(1)(-)/l(2)(+) and B -> K nu(nu) over bar over bar. Our results have smaller uncertainties than previous work, especially at low q(2). We find tensions between our results and the LHCb results in the low q(2) region, but these tensions can be reduced by adjusting the Wilson coefficients of the effective weak Hamiltonian.
Article
Physics, Particles & Fields
Xuejie Liu, Hongxia Huang, Jialun Ping, Dianyong Chen, Xinmei Zhu
Summary: This study systematically investigates different structures and channel couplings of tetraquark systems, proposing hypotheses to explain exotic resonance states. Experimental tests are expected to verify these hypotheses.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Ming-Zhu Liu, Tian-Wei Wu, Mario Sanchez Sanchez, Manuel Pavon Valderrama, Li-Sheng Geng, Ju-Jun Xie
Summary: The LHCb collaboration has recently observed three pentaquark peaks, which are very close to heavy baryon-meson thresholds. The spin-parities of these states are not yet known, but one is assumed to be 1/2- and the other two are of unknown spin-parity. The one-boson-exchange model is used to predict the quantum numbers of the molecular pentaquarks.
Article
Physics, Particles & Fields
Guo-Liang Yu, Zhen-Yu Li, Zhi-Gang Wang, Lu Jie, Yan Meng
Summary: Inspired by recent progresses in observations of the fully charmed tetraquark states by LHCb, CMS, and ATLAS collaborations, a systematic study is performed on the ground states and first radial excitations of the S- and P-wave cc (c) over bar(c) over bar system. The results from calculations using the relativized quark model show that there are no stable bound states for the fully charmed tetraquark states and their sizes are smaller than 1 fm. The X(6600) structure is suggested to be one of the 0(++)(1S) and 2(++)(1S) states or their mixtures, while X(6900) and X(7200) are proposed to be the corresponding states with different quantum numbers.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Yu-Shuai Li, Su-Ping Jin, Jing Gao, Xiang Liu
Summary: We calculate the weak transition form factors of the Ab-+ A(1520) transition and the angular distributions of the rare decays Ab-+ A(1520)(-+N over bar K)t degrees+t degrees- (NK over bar = {pK-; n over bar K0}) with unpolarized Ab and massive leptons. Our calculations are based on the three-body light-front quark model using numerical wave functions from a semirelativistic potential model. By fitting the mass spectrum of observed single bottom and charmed baryons, we fix the potential model parameters to avoid uncertainties from a simple harmonic oscillator wave function. With more data from the LHCb experiment, our results can contribute to the understanding of the Ab-+ A(1520)t degrees+t degrees- decay and b-+ st degrees+t degrees- processes.
